Nute Burn?

[AJrexxx]

Ok, we're swerving all over the place here- ... have the symptoms progressed, or stopped, and is the newer growth looking OK?

Waira sorry about that. I am just getting frustrated I consider myself a logical person, but I might be at my breaking point. Overall three of them are doing fine. 2 of the healthier ones have a few spots. The bb kush is getting new growth not looking any better though. The sourdiesel on the other hand looks a bit better but still kind of weak.

I cant for the life of me figure out how one is doing well two are okay and the other two well they are just terrible. I was hoping I made a simple newb mistake but it seems this could be a multitude of things.

 

[AJrexxx]

On the meter i just put a some storage solution in the cap per the instruction should i store it in a cup with liquid?

 

[AJrexxx]

@Waira & @jingo Thank you both so much for being patient with me I am sure by now you are wanting to rip your hair out or regretting ever answering my post.

 

[AJrexxx]

Do you do a two point calibration on your meter? 4 and 7 are usually best for our purposes. Do you keep your probe hydrated?

Meter is looking more and more suspect.

It has a 7 and a 4-10 It said to adjust the the 7 for the ph7 buffer then us the 4-10 to calibrate the ph4 buffer.

 

[Waira]

no, not quiiiiite yet mate! Dude, you're welcome, really,... and most importantly, we've spotted some equipment issues that would have continued to f*ck things up if not spotted,... (look into that membrane man, might be defective, or seated wrong) keep in mind too, that each seed is not equal to another, some pheno's are just bitchy, and also each pot is it's own little ecosystem, and can easily drift off from what the others are doing,.. Unfortunately, our hands are tied on the pH thing, so do what you can on that until you get a new meter.. keep your nute soln. mild for now to just to be safe,... If you have a local grow-shop, call them and ask if they can test the meter to confirm it's FUBAR, some may play ball on that,...

 

[AJrexxx]

no, not quiiiiite yet mate! Dude, you're welcome, really,... and most importantly, we've spotted some equipment issues that would have continued to f*ck things up if not spotted,... (look into that membrane man, might be defective, or seated wrong) keep in mind too, that each seed is not equal to another, some pheno's are just bitchy, and also each pot is it's own little ecosystem, and can easily drift off from what the others are doing,.. Unfortunately, our hands are tied on the pH thing, so do what you can on that until you get a new meter.. keep your nute soln. mild for now to just to be safe,... If you have a local grow-shop, call them and ask if they can test the meter to confirm it's FUBAR, some may play ball on that,...

Waira will do I am going to stop by there first thing in the AM. If it is the meter that would explain alot. My water is very hard so I did not think about the meter. My water is almost 500ppm out of the faucet. Which is terrible, I will check the membrane tomorrow as well. Last question would the 22 ppm screw everything up that bad? When I add my nutes my PH plummets to the low 5s. (well according to the suspect meter) I am off to smoke a bowl and relax before my head explodes.

 

[jingo]

You do have some issue with that pen I'd suspect. I have 500 ppm pH 7.4 out the faucet and am right at the limit of my r/o system max operating limits.

My system cleans that up to pH 6.4 and 15-20 ppm. I store my probe in r/o water. I add my nutes and 8-11 drops tech grade phosphoric acid for pH down and I'm good.

I personally don't add pH up to my nutrient mix. I believe doing that causes minerals to settle out throws off my mix.

I imagine you will find your actual background pH to be closer to mine than yours.

 

[AJrexxx]

yup, you're membrane is shot AJ,... what about your meter calibration? Has that been done very recently? Even so, at 20 ppm, it's a non-significant source of buffering minerals, and the source of alkalinity remains a mystery,...

Checked my membrane I have a 50gpd system and my filter was a 12gpd membrane. Ordered a new one should be in tomorrow. One problem down one to go.

 

[AJrexxx]

Of the two plants that had issue the blueberry kush looks like the damage has stopped it is not really looking any better. The sour diesel is looking better and the new growth is healthy. I will call that a win. Thank you both @jingo & @Waira for helping me figure out the RO and the PH meter issue I appreciate it. to you both.

 

[Waira]

-- 500ppm-Holy poop tea, that's freaking rocks in the pipes there! ... shiiiiit, and it fit into the same housing?? ...many of them are standardized in size because of the common use of that housing across many brands,...
... no, 22ppm is still very very soft water,.. but the readings on a "broken in" membrane should be low single digits ppm,.. mine's a 24gpd unit, sold by an aquarium brand Coralife; it runs 2-4 usually, 4 indicating it's time to back flush the membrane,... buuut, it wouldn't hurt to chat with your manufacturer about this (the manual may have info about normal ppm's),... only when the membrane is loaded, or degraded by chlorine (indicating your carbon filter has been max'ed out for a while), or just plain all-done will the ppm's get up that high,..I think the 12gpd unit, even if it fit, wasn't up to the task for that volume output, or a seal inside leaked,...
So, about RO/DI water and pH,.. all the pH buffering minerals (mainly CaCO3) have been removed, so the without them in there, even tiny inputs can cause wild pH swings... and pH meters have difficulty measuring it, but it's not important anyway, it won't be far off 7.0 anyway (CO2 dissolving in water will acidify it slightly)... Here's where the Ca-Mg comes in! that will add some buffering minerals to it, as well as the extra Ca the coco needs (coco binds Ca strongly, so that's why extra is needed)... many of the nute lines already have self buffering capacity as well, like AN does, and they recommend using RO/DI water, or very soft water at least (not softened water mind you, done by ion exchange softeners.... those put Na+ into the water, which is toxic at low levels to canna').... Consider switching to a brand that has coco-specific formulations (AN, Canna for example), it's simplify things!